Yes, construction work can be hard and dangerous, however, the rewards are good for those who are willing to learn all facets of the work and who behave in a safe and responsible manner.
Occupational Safety and Health are serious concerns for every individual working on Construction Sites. It would be prudent to attend OS&H training that is related to the Construction Industry. When working on a construction site you have to be ongoing safety conscious because you are responsible for your own safety.
There are plenty of Links on the Internet about Occupational Safety & Health and about the Construction Industry. Learn as much as possible so that you have an edge before you become involved in this worthwhile career.
Very best wishes for your future.
Earth Moving, Mining and Marine experience.